196 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DELAWARE: Wilmington, Chase 3616. 
Mary.anp: Little Falls, Vasey in 1884; Cabin John, Chase 2853, 3772; West 
Chevy Chase, Chase 2946, 
Hitchcock 361. 
District or CoLuMBIA: [House 911, 
Kearney 28 in part. 
Virarnia: Arlington, Chase 2964. 
Nortu Carona: Raleigh, Ashe 
in 1895, Chapel Hill, Chase 
3059, 3061, 3072; Jacksonville, 
Chase 3192. 
Sourn CaroLina: Orangeburg, 
Hitchcock 6, 14164. 
Grorata: Dublin, Harper 1349. Fig. 196.—Distribution of P. yadkinense. 
TENNESSEE: Sumner County, Gat- 
tinger in 1883 (Univ. Tenn. Herb.). 
ApaBaMa: Tensaw, Tracy 8029. 
Lourstana: Lake Charles, Hitchcock 1164. 
112. Panicum roanokense Ashe. 
Panicum roanokense Ashe, Journ. Elisha Mitchell Soc. 15: 44. 1898. “Type 
material collected by writer in dry soil, Roanoke Island, N. C. June, 1898. Also 
collected at Rose Bay and Mackleyville, N. C., the same month.”’ The type could 
not be found in Ashe’s herbarium. In the Biltmore Herbarium is a specimen from 
Manteo, Roanoke Island, N. C., collected by Ashe, June 10, 1898, and labeled by him 
Panicum roanokense Ashe. This is a duplicate type or possibly the type. It con- 
sists of two vernal culms with mature primary panicles. 
Panicum curtivaginum Ashe, Journ. Elisha Mitchell Soc. 16:85. 1900. ‘‘Collected 
at Petit Bois Island, Mississippi, May 8, 1898 by 8. M. Tracy.’’ An unmounted 
specimen of the collection cited was found in a cover marked “P. curtivaginatum sp, 
nov.’’? in Ashe’s herbarium. No name was written on the Tracy label, which bears 
the number 4584. As this was the only specimen of this collection found in Ashe’s 
herbarium it is taken as the type. It consists of a tuft of three slender vernal culms 
with over-mature panicles. The autumnal form is not represented, but in a specimen 
of Tracy 4584 in the National Herbarium the autumnal 
culms of the previous year are attached to the tuft. 
The spikelets are described as ‘‘quite 1.5 mm.”’ long, 
but they measure 2 mm. 
DESCRIPTION. 
Vernal form cespitose, somewhat glaucous olive 
green; culms erect or ascending, 50 to 100 cm. high; 
Fig. 197.—P. roanokense. From sheaths half as long as the internodes or less, gla- 
Tose Bay collected by Ashe at prous, or the lowermost sometimes sparsely pubescent; 
: blades at first stiffly erect, later ascending or spread- 
ing, 6 to 9 cm. long, 3 to 8 mm. wide, tapering to both ends, glabrous or with a 
few hairs around the base; panicles 4 to 8 cm. long, scarcely as wide, the branches 
spreading; spikelets. mm. long, 1 mm. wide, ellipsoid-obovoid, very turgid, glabrous; 
first glume about one-third the length of the spikelet; second glume and sterile lemma 
strongly nerved, subequal, the glume rather conspicuously purple-tinged at base, 
scarcely covering the fruit at maturity; fruit 1.6 mm. long, 0.9 mm. wide, ellipsoid. 
Autumnal form erect or decumbent, branching at the middle and upper nodes, the 
branches numerous but not in tufts, the primary internodes elongating and becoming 
